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Forget the cleaning for now. Concentrate on getting your exposures and processing right. The LRGB is way over exposed for your apparent location, meaning your showing a lot of skyglow and noise. And frankly 300 sec broadband subs are too long, try stacking many shorter subs. Make sure you shoot Darks and Bias subs as well to build a Master Dark and Master Bias and use them. Forget flats for now, get you basics sorted out.
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